In May 1991, St Kilda Bus Service was purchased with route 606 Port Melbourne - St Kilda and rebranded Werribee Bus Lines.[4] Later the Point Cook, Sitch and Weribee operations were also brought under the Westrans brand.

In February 2009, ComfortDelGro Cabcharge acquired Kefford Corporation for A$149.2 million,[5] including the Eastrans, Westrans, Davis (Ballarat) and Benders Busways (Geelong) brands. At the time of its acquisition by CDC in 2009, Kefford was the fourth-largest bus operator in Victoria with a 16% market share, and with a fleet of 328 buses and six depots.

In 2014, CDC Victoria was restructured, with Davis Busways becoming a subsidiary called CDC Ballarat and Benders Busways becoming a subsidiary called CDC Geelong. In October 2014, Eastrans and Westrans were united and rebranded as CDC Melbourne.

At the time of its acquisition of Kefford in 2009, CDC Victoria acquired a fleet of 328 buses. When the Driver Group was purchased in 2013, CDC Victoria also acquired 42 buses, bringing the Victorian fleet to 420 buses.[7] As at March 2016, the CDC Melbourne fleet consisted of 277 buses and coaches.[11] At April 2018, prior to the acquisition of Tullamarine Bus Lines, the fleet consisted of 281 buses and coaches. When Tullamarine Bus Lines was acquired in 2018, CDC Melbourne also acquired 36 buses, bringing the fleet to 317 buses and coaches.

Westrans fleet livery was white with red stripes for buses at Altona and Sunshine depots, and white with blue stripes at Werribee depot. Eastrans fleet livery was white with white and green stripes. The Public Transport Victoria white and orange diamonds livery has been adopted as standard for route service buses and an orange, blue and white livery was adopted for charter buses. However some buses still retain the old Westrans livery with CDC Melbourne signage.